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Table 2 Comparison of distribution for pedicle screw misplacement in the PPS side and the open side

From: Accuracy of pedicle screw insertion for unilateral open transforaminal lumbar interbody fusion: a side-by-side comparison of percutaneous and conventional open techniques in the same patients

Categorical variableP-sideO-sideP-value
Adequate insertion (%)349 (91.1)346 (90.5)Ā 
Misplacement (%)34 (8.9)37 (9.5)NS
Penetration (%)Minor28 (7.3)32 (8.4)NS
Moderate5 (1.3)4 (1.0)NS
Severe1 (0.3)1 (0.3)NS
DirectionInferior21NS
Superior21NS
Medial2223NS
Lateral812NS
LevelL211NS
L335NS
L41815NS
L5815NS
S141NS
  1. NS nonsignificant, P-side PPS side, O-side Open side